Sometimes when you’re backpacking, the last thing you need is something else to carry. So leave the bulky hand-held global positioning system unit at home and take along the Foretrex 301 ($150, garmin.com). This slim, wrist-mounted GPS receiver is rugged and waterproof and will keep you pointed in the right direction. For an extra $50 or so, the Foretrex 401 adds an electronic compass, barometric altimeter and a few other features. Remember, though, no technology is perfect. Never hit the trail without a good ol’ map and compass — and be sure you know how to use them. They’ll never run out of batteries.